CN107735561A - gas supply system - Google Patents

gas supply system Download PDF

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Publication number
CN107735561A
CN107735561A CN201680034088.6A CN201680034088A CN107735561A CN 107735561 A CN107735561 A CN 107735561A CN 201680034088 A CN201680034088 A CN 201680034088A CN 107735561 A CN107735561 A CN 107735561A
Authority
CN
China
Prior art keywords
gas
boil
liquefied
pipeline
caloric value
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201680034088.6A
Other languages
Chinese (zh)
Other versions
CN107735561B (en
Inventor
李元斗
姜镐淑
朴秀律
李钟哲
李孝垠
韩俊熙
黄霓琳
尹虎炳
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Samsung Heavy Industries Co Ltd
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Samsung Heavy Industries Co Ltd
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Filing date
Publication date
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Publication of CN107735561A publication Critical patent/CN107735561A/en
Application granted granted Critical
Publication of CN107735561B publication Critical patent/CN107735561B/en
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
    • B63B25/16—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed heat-insulated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02M21/0287—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers characterised by the transition from liquid to gaseous phase ; Injection in liquid phase; Cooling and low temperature storage
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B73/00—Combinations of two or more engines, not otherwise provided for
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
    • F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M25/00—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture
    • F02M25/08—Engine-pertinent apparatus for adding non-fuel substances or small quantities of secondary fuel to combustion-air, main fuel or fuel-air mixture adding fuel vapours drawn from engine fuel reservoir
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C5/00—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures
    • F17C5/02—Methods or apparatus for filling containers with liquefied, solidified, or compressed gases under pressures for filling with liquefied gases
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
    • F17C7/02—Discharging liquefied gases
    • F17C7/04—Discharging liquefied gases with change of state, e.g. vaporisation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
    • F25J1/0022—Hydrocarbons, e.g. natural gas
    • F25J1/0025—Boil-off gases "BOG" from storages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
    • F25J1/0032—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration"
    • F25J1/004—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by flash gas recovery
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0201—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using only internal refrigeration means, i.e. without external refrigeration
    • F25J1/0202—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using only internal refrigeration means, i.e. without external refrigeration in a quasi-closed internal refrigeration loop
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0228—Coupling of the liquefaction unit to other units or processes, so-called integrated processes
    • F25J1/0229—Integration with a unit for using hydrocarbons, e.g. consuming hydrocarbons as feed stock
    • F25J1/023—Integration with a unit for using hydrocarbons, e.g. consuming hydrocarbons as feed stock for the combustion as fuels, i.e. integration with the fuel gas system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0244—Operation; Control and regulation; Instrumentation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0257—Construction and layout of liquefaction equipments, e.g. valves, machines
    • F25J1/0275—Construction and layout of liquefaction equipments, e.g. valves, machines adapted for special use of the liquefaction unit, e.g. portable or transportable devices
    • F25J1/0277—Offshore use, e.g. during shipping
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J2220/00—Processes or apparatus involving steps for the removal of impurities
    • F25J2220/60—Separating impurities from natural gas, e.g. mercury, cyclic hydrocarbons
    • F25J2220/62—Separating low boiling components, e.g. He, H2, N2, Air
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/30—Use of alternative fuels, e.g. biofuels

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Ocean & Marine Engineering (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

The present invention discloses gas supply system.It includes：Holding vessel, the compression unit by steam pressure of liquid gas and steam are stored, after the steam after pressurization is by compression unit, is transported to the 1st gas supply pipe of the 1st engine；Branch is formed from compression unit end, the partial vapor after compressed portion's compression transports to the 2nd supply burning line of the 2nd engine；The part boil-off gas supply after pressurization is received, is transported to re-liquefied pipeline；The caloric value adjustment portion of measure and the caloric value of regulation the 2nd engine supply combustion gas.Re-liquefied pipeline, including：The cooling end of steam after cooling pressurization；After steam after pressurization is by cooling end, the 1st expansion valve of the 1st wheel decompression is transported to；It is divided into the 1st gas-liquid separator of gas and liquid by the steam of gas-liquid mixture phase after the 1st expansion valve；The gas that 1st gas-liquid separator is separated supplies the vapour-cycling pipeline of the 2nd engine；And receive the liquefied gas pipeloop for the liquid that the 1st gas-liquid separator separates go out.

Description

Gas supply system
Technical field
The present invention relates to gas supply system.
Background technology
As supervision of the International Maritime Organization (IMO) to greenhouse gases and various air pollutant emissions is strengthened, in shipbuilding In shipping business, replace the conventional fuels such as heavy oil and diesel oil to be used for the situation of ship combustion gas with clean energy resource natural gas and increase.
In order to facilitate storing and transporting, natural gas (Natural Gas) is generally cooled to -162 degrees Celsius, by its volume 1/600 is compressed to, is managed in the form of the ultralow temperature liquefied natural gas (Liquefied Natural Gas) of water white transparency And application.
This liquefied natural gas is accommodated on hull and is stored and transports in the holding vessel of heat-insulated processing.But in actual behaviour In work, it can not be transported completely by liquefied natural gas is heat-insulated, outside heat can be inside continued conduction to holding vessel, this Result in liquefied natural gas naturally to vaporize, caused boil-off gas is deposited in inside holding vessel.Boil-off gas can cause The internal pressure of holding vessel rises, and causes storage tank to deform and damage, it is therefore desirable to have the scheme of processing and elimination boil-off gas.
The method previously used, it is to be arranged boil-off gas by installing exhaust mast (Vent mast) on the upside of holding vessel Remove, or utilize GCU (Gas Combustion Unit) by boil-off gas burning-up etc..But from the perspective of efficiency, these are all It is worthless.The method used now, it is that boil-off gas and liquefied natural gas is together or separated, is given as fuel gas supply The engine of ship, or using the reliquefaction installation that can realize kind of refrigeration cycle, boil-off gas is re-liquefied.
On the other hand, natural gas is a kind of except methane (Methane), also comprising ethane (Ethane), propane (Propane), the mixture of butane (Butane), nitrogen etc. (Nitrogen).Wherein, the boiling point of nitrogen is about -198.5 Celsius Degree, well below other compositions, methane (boiling point is -161.5 degrees Celsius), ethane (boiling point is -89 degrees Celsius).
Therefore, boil-off gas caused by being vaporized naturally inside holding vessel, is that boiling point is relatively low comprising more composition Nitrogen, which results in the re-liquefied efficiency of boil-off gas is reduced, application and processing on boil-off gas generate influence.
In addition, using boil-off gas as fuel gas supply to engine of boat and ship when, the nitrogen contained in boil-off gas can be brought Influence, reduce the caloric value of combustion gas.Therefore, it is necessary to the re-liquefied efficiency of boil-off gas and the caloric value of combustion gas be lifted, with more Efficiently apply and manage combustion gas.
The content of the invention
Embodiments of the invention, there is provided the gas supply system of the re-liquefied efficiency of boil-off gas can be improved.
Embodiments of the invention, there is provided more efficiently can apply and manage the gas supply system of combustion gas.
Embodiments of the invention, there is provided the combustion gas of the caloric value for the combustion gas that can efficiently adjust and maintain to supply to engine supplies To system.
Embodiments of the invention, with gas supply system simple for structure, causing equipment high efficiency running.
Embodiments of the invention, there is provided the gas supply system of efficiency can be improved.
Gas supply system provided by the invention, it includes：Store the holding vessel of liquid gas and boil-off gas；Possessing will The compression unit of boil-off gas pressurization in the holding vessel, after boil-off gas after pressurization is by the compression unit, is conveyed To the 1st fuel gas supply pipeline of the 1st engine；Branch is formed at the compression unit middle-end, after the compressing section compresses Part boil-off gas is transported to the 2nd supply burning line of the 2nd engine；Receive the confession of the part boil-off gas after the pressurization Give, carried out re-liquefied re-liquefied pipeline；And measure and the heating for adjusting the caloric value to the supply combustion gas of the 2nd engine Measure adjustment portion.The re-liquefied pipeline, it is included：Cool down the cooling end of the boil-off gas after the pressurization；By compression unit plus Boil-off gas after pressure, carried out the 1st expansion valve of the 1st wheel decompression；Gas-liquid mixture phase after the 1st expansion valve will be passed through Boil-off gas be separated into the 1st gas-liquid separator of gas componant and liquid component；1st gas-liquid separator separates are gone out Gas componant is supplied to the boil-off gas pipeloop of the 2nd engine；And receive what the 1st gas-liquid separator separates came out The liquefied gas pipeloop of liquid component.
The caloric value adjustment portion, it includes：The heating that measure is supplied to the caloric value of the 2nd engine gas measures Determine device；The flow control valve possessed respectively in the 2nd fuel gas supply pipeline and the boil-off gas pipeloop.
The caloric value adjustment portion, it is included：By the 1st gas-liquid separation of the and then boil-off gas circular route flowing Gas componant in device, deliver to the caloric value regulation pipeline that the liquefied gas pipeloop is circulated；And the caloric value The flow control valve possessed in adjustment portion.
The respective flow control valve, the combustion gas caloric value information determined according to the heating-value determination device, to control Running.
The re-liquefied pipeline, it includes：Installed in liquefied gas pipeloop；1st gas-liquid separator separates are gone out The liquid component come carries out the 2nd expansion valve of the 2nd wheel decompression；After will be by the 2nd expansion valve, the evaporation of gas-liquid mixture phase Gas is separated into the 2nd gas-liquid separator of gas componant and body fluid components；By the gas of the 2nd gas-liquid separator separates into Point, supply to the vapor return line line of the compression unit front end on the holding vessel or the 1st fuel gas supply pipeline； And the liquid component by the 2nd gas-liquid separator sub-department, it is supplied to the liquefied gas restoring pipeline of the holding vessel.
The cooling end, it is included：By the boil-off gas after pressurization, with the boil-off gas of the compression unit front end and described At least one of gas componant that 1st gas-liquid separator separates go out, carry out the heat exchanger of heat exchange.
1st expansion valve, it is characterized in that, according to the gaseous-pressure condition of the 2nd engine calls, or the part The corresponding pressure condition of pressure of boil-off gas after pressurization, the boil-off gas after the pressurization is depressurized.
Gas supply system in the embodiment of the present invention, there is the effect for the re-liquefied efficiency for improving boil-off gas.
Gas supply system in the embodiment of the present invention, there is the effect for efficiently applying and managing combustion gas.
Gas supply system in the embodiment of the present invention, there is the hair for efficiently adjusting and maintaining the combustion gas to engine supply The effect of heat.
Gas supply system in the embodiment of the present invention, there is the effect for improving efficiency.
Gas supply system in the embodiment of the present invention, have with effect simple for structure, causing equipment high efficiency running.
Brief description of the drawings
The detailed description made by reading with reference to the following drawings to non-limiting example, further feature of the invention, Objects and advantages will become more apparent upon：
Fig. 1 is the related gas supply system of embodiments of the invention.
Fig. 2 is the related gas supply system of the other embodiment of the present invention.
Embodiment
Embodiments of the invention are described in detail below with reference to accompanying drawings.Following examples be in order to will the present invention Technological thought is fully conveyed to the people with general knowledge in the technical field of the invention and provided.It is of the invention and unlimited In examples provided below, it can also be embodied in other forms.Accompanying drawing is eliminated and illustrated for the clear and definite present invention The diagram of irrelevant portions, and in order to help to understand, slightly exaggerate when showing inscape.
The related gas supply system 100 of Fig. 1 displaying embodiments of the invention.
Reference picture 1, the related gas supply system 100 of embodiments of the invention include：Holding vessel 110；Possessing to store The compression unit 121 of boil-off gas pressurization in tank 110, the boil-off gas after being pressurizeed by compression unit 121, is transported to the 1st 1st fuel gas supply pipeline 120 of engine；The supply of the part boil-off gas after the pressurization is received, is carried out re-liquefied Re-liquefied pipeline 130；Boil-off gas after the part of compression unit 121 is pressurizeed is supplied to the 2nd gas supply pipe of the 2nd engine Line 140；And measure and the caloric value adjustment portion for adjusting the caloric value to the supply combustion gas of the 2nd engine.
Following examples are in order to be best understood from institute's illustrated example of the present invention, suitable for liquefied natural gas and its caused Boil-off gas illustrates, but is not limited to the embodiment, to various liquefied gas such as liquefied ethane air-liquid hydrocarbon gas And boil-off gas caused by them are equally applicable, it can regard as and with specified particular identical understand.
Holding vessel 110 is used to storing or storing liquefied natural gas and its caused boil-off gas.Holding vessel 110 has heat-insulated The diaphragm type cargo hold of processing, outside heat is entered and causes the vaporization of liquefied natural gas to reach minimum.Holding vessel 110 can From natural gas grown place untill receiving and accommodating or store the destination unloading of liquefied natural gas, safely take care of and liquefy naturally Gas and boil-off gas, and as described below, the combustion gas application as boat propulsion engine or ship development engine etc..
Under normal circumstances, although holding vessel 110 is installed after have passed through heat-insulated processing, in practical operation, it is difficult to accomplish The heat of outside is separated completely, the liquefied natural gas inside holding vessel 110 inevitably vaporizes, and produces boil-off gas.Such as This one, boil-off gas can cause the internal pressure of holding vessel 110 to rise, and may induce the deformation and blast of holding vessel 110 Deng danger, therefore, it is necessary to boil-off gas is removed or handled from holding vessel 110.Therefore, as described in the embodiment, will store up Boil-off gas caused by the inside of tank 110 is deposited, by the 1st fuel gas supply pipeline 120 or the 2nd fuel gas supply pipeline 140, as supply To the combustion gas of engine, or carried out by re-liquefied pipeline 130 re-liquefied, be supplied to holding vessel 110 again.Meanwhile Illustrated not in the drawings, can be supplied to holding vessel 110 top be provided with exhaust mast do not mark, to handle or be lost Boil-off gas.
Engine receives the combustion gas such as liquefied natural gas and the boil-off gas of the receiving of holding vessel 110, produces marine propulsion power, or Produce the power supply of ship internal unit etc..Comparatively engine, which can be divided into, receives the 1st engine that high-pressure gas is exported, And comparatively receive the 2nd engine that low-pressure fuel gas is exported.Comparatively 1st engine receives high-pressure gas progress Output, such as ME-GI engines or X-DF engines；Comparatively 2nd engine receives low-pressure fuel gas and exported, such as DFDE engines etc..But affiliated example is not limited to, the engine types of various several amount and type are all equally applicable, can regard as and phase With understand.
1st fuel gas supply pipeline 120 will after the pressurization of boil-off gas present in holding vessel 110, supply to the 1st engine and Re-liquefied pipeline 130.The entrance port of 1st fuel gas supply pipeline 120 is connected with the inside of holding vessel 110, exit port warp The 1st fuel gas supply pipeline 120 is crossed with the 1st engine to be connected.In 1st fuel gas supply pipeline 120, in order to by boil-off gas handle to Meet the condition of engine calls, have multiple stage compressor 121a compression unit 121.It is described below on the rear end of compression unit 121 Re-liquefied pipeline 130 from the branch of the 1st fuel gas supply pipeline 120.
Compression unit 121 it include：The compressor 121a of Compression Evaporation gas；Compress and cool down the boil-off gas after heating Cooler 121b.When there is the different engine of multiple pressure conditions, the 2nd fuel gas supply pipeline 140 described below is from compression The medial end portions in portion 121 start, and the boil-off gas after part pressurization is supplied to the 2nd engine.
Middle compression unit 121 shown in Fig. 1 is made up of 5 sections of compressor 121a and cooler 121b, is only used as example, according to The pressure condition and temperature of engine calls, compression unit 121 can be by the compressor 121a and cooler 121b groups of varying number Into.Meanwhile the 1st front end of compression unit 121 on fuel gas supply pipeline 120, the cooling of re-liquefied pipeline 130 described below is installed Portion 131, hereafter will be described in more detail.
Re-liquefied pipeline 130 receives the boil-off gas after being pressurizeed by the compression unit 121 of the 1st fuel gas supply pipeline 120, will Its progress is re-liquefied.
Re-liquefied pipeline 130 it include：The cooling end 131 of boil-off gas after cooling pressurization；Boil-off gas after pressurization leads to Behind supercooling portion 131, the 1st expansion valve 132 of the 1st wheel decompression is carried out；After will be by the 1st expansion valve 132, gas-liquid mixed shape The boil-off gas of state is separated into the 1st gas-liquid separator 133 of gas componant and liquid component；It will divide from the 1st gas-liquid separator 133 Gas componant at reason is supplied to the boil-off gas pipeloop 134 of the 2nd engine；Will be from the sub-department of the 1st gas-liquid separator 133 Liquid component carry out the 2nd wheel decompression the 2nd expansion valve 136；After will be by the 2nd expansion valve 136, the evaporation of gas-liquid mixture phase Gas is separated into the 2nd gas-liquid separator 137 of gas componant and liquid component；The gas that will be isolated from the 2nd gas-liquid separator 137 The boil-off gas pipeloop 138 that body composition resupplies to the fuel gas supply pipeline 120 of holding vessel 110 or the 1st；Will be from the 2nd gas-liquid The liquid gas pipeloop 139 that the liquid component that separator 137 is isolated resupplies to holding vessel 110.
Cooling end 131 is cooled down the boil-off gas after being supplied to the pressurization of re-liquefied pipeline 130.Before compression unit 121 The boil-off gas at end moves with the 1st fuel gas supply pipeline 120, and the gas componant that the 1st gas-liquid separator 133 is isolated is under The text boil-off gas pipeloop 134 moves, the heat exchanger of cooling end 131, can be by the boil-off gas after pressurization, with this Both carry out heat exchange.After the pressurization of compression unit 121, temperature and pressure have all risen boil-off gas after pressurization, pass through Low-temperature evaporation gas before the compression unit 121 of 1st fuel gas supply pipeline 120, with moving with boil-off gas pipeloop 134 Cryogenic liquid composition carry out heat exchange, therefore boil-off gas after the pressurization for the high temperature that can will be supplied to re-liquefied pipeline 130 Cooled down.Similarly there is heat exchanger in cooling end 131, even if without other cooling devices, also can be by the evaporation after pressurization Gas is cooled down, and unnecessary power supply can be avoided to waste, and simplifies equipment, improves the efficiency of equipment running.
1st expansion valve 132, it is arranged on the rear end of cooling end 131.1st expansion valve 132 is by after by cooling end 131 The boil-off gas that pressurizes carries out the 1st wheel decompression, is cooled to and expands, makes its re-liquefied.For example, the 1st expansion valve 132 can be with It is throttle Joule-Thomson Valve.1st expansion valve 132 can will pass through the pressurization boil-off gas after cooling end 131 Body, it is decompressed to stress level corresponding to the gaseous-pressure condition of the 2nd engine calls.It is to this detailed description below.
1st liquefaction separator 133 will pass through the gas-liquid mixed shape after the 1st expansion valve 132, the cooling of the wheel of progress the 1st and decompression The boil-off gas of state, is separated into gas componant and liquid component.It is cold when boil-off gas after pressurization is by 1 expansion valve 132 But and decompression, realize re-liquefied, but flash steam Flash Gas can be produced in decompression process.Therefore, the 1st liquefaction separator 133 In, accommodate the boil-off gas by the 1st expansion valve 132, gas-liquid mixture phase, and be separated into gas componant and liquid into Point so that re-liquefied process has more confidence level, can obtain each composition respectively.
Meanwhile natural gas is a kind of except methane Methane, also comprising ethane Ethane, propane Propane, butane The Nitrogen such as Butane, nitrogen mixture.Wherein, the boiling point of nitrogen be about -198.5 degrees Celsius, well below other into Point, methane boiling point is -161.5 degrees Celsius, ethane boiling point is -89 degrees Celsius.Because the boiling point of nitrogen gas component is very low, can from but Boil-off gas so is produced in the interior evaporation of holding vessel 110, it is relatively early vaporized, therefore also contains more nitrogen gas component.Steam Nitrogen content concentration got angry in body is higher, and the re-liquefied efficiency that may result in boil-off gas is reduced.
Particularly, in order that boil-off gas is re-liquefied, compression unit 121 pressurizes boil-off gas, after cooling end 131 will pressurize Boil-off gas cooling, the 1st expansion valve 132 by after pressurization boil-off gas depressurize, now the 1st gas-liquid separator 133 is isolated The gas componant such as flash steam in, the relatively low nitrogen gas component content of boiling point is just higher.If the gas containing nitrogen-rich gas composition Body composition re-enters gas burning system 100 and circulated, and can not only reduce the re-liquefied efficiency of boil-off gas, into the gas of circulation Body composition can also bring load, it is necessary to which compressor 121a is arranged into high configuration to compressor 121a of compression unit 121 etc., cause to set Standby operational paradigm is low.
The nitrogen gas component phase that the gas componant that the liquefaction separator 133 of boil-off gas pipeloop the 134, the 1st is isolated contains To higher, the 2nd engine is given as fuel gas supply.As described above, cool down through the 1st expansion valve 132, by the evaporation after pressurization During gas decompression, in caused gas componant, the content of nitrogen gas component is of a relatively high.Then, boil-off gas circulates Pipeline 134 will wherein receive the liquid component of re-liquefied efficiency reduction, be utilized as fuel gas supply to the 2nd engine, both Combustion gas can be made efficiently to be utilized, the nitrogen gas concn that the liquid component that the 1st liquefaction separator 133 is isolated contains is relatively low, And can causes the re-liquefied efficiency of these liquid components to get a promotion.
1st expansion valve 132, by by the boil-off gas after the pressurization after cooling end 131, it is decompressed to and meets the 2nd engine The level of required pressure condition.Boil-off gas pipeloop 134, even if without other compression set, also can be by the 1st gas-liquid The gas componant that separator 133 is isolated gives the 2nd engine immediately available as fuel gas supply.
Boil-off gas pipeloop 134 passes through the cooling end 131 that is formed by heat exchanger.Nitrogen gas component is with boil-off gas Pipeloop 134 moves, using the cold and hot of the gas componant containing nitrogen-rich gas, with adding for re-liquefied pipeline 130 movement While boil-off gas after pressure cools off, the height of the boil-off gas after the pressurization with the movement of re-liquefied pipeline 130 is received Warm amount, it is horizontal according to corresponding to the fuel gas temperature condition of the 2nd engine calls, lifted with boil-off gas pipeloop 134 The temperature of mobile gas componant.
Boil-off gas pipeloop 134, it includes the flow control valve 152 of caloric value regulation pipeline described below, energy The fuel gas supply amount that enough regulations are moved with boil-off gas pipeloop 134 is as follows to this detailed description.
The liquid component relatively low containing nitrogen gas component that 1st gas-liquid separator 133 is isolated, as liquefied gas circulates Pipeline 135 moves, the 2nd expansion valve 136 being had by liquefied gas pipeloop 135 carry out the 2nd wheel decompression and it is re-liquefied.Ibid institute State, the nitrogen gas component contained is lower, the re-liquefied efficiency with regard to that can improve boil-off gas, the liquid that the 1st gas-liquid separator 133 is isolated The nitrogen gas component that body composition contains is relatively low, is depressurized even across the 2nd expansion valve 136, the generation of the gas componant such as flash steam Also can reduce, re-liquefied efficiency is improved.For example, the 2nd expansion valve 136 can be throttle Joule-Thomson Valve, the 2nd expansion valve 136 can be decompressed to the corresponding stress level of the internal pressure of holding vessel 110.
2nd gas-liquid separator 137, can will by the 2nd expansion valve 136, by the 2nd wheel cool down and decompression after, gas-liquid is mixed The boil-off gas of conjunction state is separated into gas componant and liquid component.The liquid component of 1st gas-liquid separator 133, the nitrogen contained Gas constituent concentration is relatively low, is depressurized again through the 2nd expansion valve 136, is all able to re-liquefied although most of, still suffers from a small amount of nitrogen Gas composition, it can not possibly be realized in practical operation complete re-liquefied.Therefore, by the 2nd expansion valve 136, gas-liquid will be become and mixed The boil-off gas of conjunction state, isolate gas and liquid component using the 2nd gas-liquid separator 137 so that re-liquefied process is more With confidence level, each composition can be obtained respectively.
Boil-off gas pipeloop 138 resupplies the gas componant that the 2nd gas-liquid separator 137 is isolated to holding vessel 110 or the 1st fuel gas supply pipeline 120, installed in the 2nd gas-liquid separator 137 and the gas-liquid separator 137 of holding vessel 110 or the 2nd And the 1st between fuel gas supply pipeline 120.As shown in figure 1, boil-off gas pipeloop 138 is by the gas of the 2nd gas-liquid separator 137 Body composition, resupply to the front end of compression unit 121 on the top of the 1st fuel gas supply pipeline 120, in addition to this it is possible to from the 2nd gas-liquid Separator 137 is resupplied to holding vessel 110, or is supplied again to the 1st fuel gas supply pipeline 120 and holding vessel 110 simultaneously Give.
Liquefied gas follows recovery line 139 and carries out the liquid component that the 2nd gas-liquid separator 137 is isolated to holding vessel 110 Resupply, between the 2nd gas-liquid separator 137 and holding vessel 110.Liquefied gas follows the entrance port of recovery line 139 With the downside UNICOM of the 2nd gas-liquid separator 137, exit port inside holding vessel 110 with being connected.Liquefied gas follows recovery line In 139, controlled valve is installed and not marked, to adjust from holding vessel 110 reclaim it is re-liquefied after liquefied natural gas supply Amount.
2nd fuel gas supply pipeline 140 branch since the middle-end of compression unit 121 of the 1st fuel gas supply pipeline 120, by part Boil-off gas after pressurization is supplied to the 2nd engine.In the entrance port of 2nd fuel gas supply pipeline 140 and compression unit 121 End is connected, and after exit port merges with boil-off gas pipeloop 134, is connected with the 2nd engine.
Comparatively 2nd engine receives low-pressure fuel gas and exported, at the middle-end of compression unit 121 of Compression Evaporation gas Branch, gas that can be after receiving portion pressurization is as fuel gas supply running, and with boil-off gas circulation pipe described above Gas componant that line 134 moves, containing nitrogen-rich gas composition together, receives fuel gas supply.Meanwhile though do not enter in Fig. 1 Rower shows, when the gas supply amount supplied by the 2nd fuel gas supply pipeline 140 and boil-off gas pipeloop 134, higher than the 2nd During the fuel gas supply amount of engine calls, the GCUGas Combustion Unit for receiving remaining fuel gas supply are installed, from the 2nd The exit port branch of fuel gas supply pipeline 140, is connected with GCU.
Caloric value adjustment portion can determine and adjust the combustion gas caloric value for being supplied to the 2nd engine.
Caloric value Heating Value, refer to the heat discharged after the combustion gas completely burned of unit mass.In natural gas Methane, butane and propane caloric value it is of a relatively high, be lifted combustion gas caloric value components methane caloric value：About 12, 000kcal/kg, butane caloric value：About 11,863kcal/kg, propane caloric value：About 2,000kcal/kg, and the heating of nitrogen Measure then very low nitrogen caloric value：About 60kcal/kg, the absolute content or concentration of nitrogen gas component are higher, and the gross calorific power of combustion gas is just It can reduce.Now, the gross calorific power of the natural gas supplied to engine is too low, beats the minimum caloric value bar less than engine calls Part, the output of engine will be had an impact so that engine produces unnecessary load.
As described above, in order to lift the re-liquefied efficiency of re-liquefied pipeline 130, the 1st gas-liquid separator 133 is isolated , it is relative containing the relatively low liquid component of nitrogen gas component concentration, supply to the 2nd expansion valve 136, will be relative dense containing nitrogen gas component The higher gas componant of degree, is supplied to the 2nd engine by boil-off gas pipeloop 134, with boil-off gas pipeloop The nitrogen-rich gas composition of 134 movements, may result in the combustion gas caloric value for being supplied to the 2nd engine, will less than the 2nd engine The caloric value asked.
Reference picture 1, the caloric value adjustment portion of the related gas supply system 100 of embodiments of the invention include：Measure or Calculate the heating-value determination device 150 for the caloric value for being supplied to the 2nd engine gas；It is separately mounted to the 2nd fuel gas supply pipeline 140 And the flow control valve 151,152 in boil-off gas pipeloop 134.
Heating-value determination device 150 is capable of the caloric value of combustion gas below the real time measure：Supplied by the 2nd fuel gas supply pipeline 140 To the boil-off gas after the part pressurization to the 2nd engine, and comprising being supplied to the 2nd by boil-off gas pipeloop 134 The combustion gas of gas componant in 1st gas-liquid separator 133 of engine.The mark that heating-value determination device 150 is made up of display Show that portion does not mark, transmit the combustion gas caloric value information measured, inform the occupant of ship, or do not mark transmission with control unit The combustion gas caloric value information measured, control unit is by the condition caloric value of the 2nd engine inputted, with heating-value determination device The 150 combustion gas caloric value information transmitted are compared analysis, adjust the switch degree of flow control valve described below.
Heating-value determination device 150 shown in Fig. 1, installed in the boil-off gas circulation pipe on the 2nd fuel gas supply pipeline 140 The branch rear end that line 134 merges, the caloric value of combustion gas is determined as shown in the figure, but if the combustion for being supplied to the 2nd engine can be measured Gas caloric value, its position can be changed.
Flow control valve 151,152 is separately mounted on the 2nd fuel gas supply pipeline 140 and boil-off gas pipeloop 134. The combustion gas caloric value information that the heating-value determination device 150 measured according to two flow control valves 151,152 is measured, and the 2nd start The condition caloric value information of machine, its switch degree can be automatically adjusted either manually or by control unit by operator, to adjust combustion The caloric value of gas.
For example, when the combustion gas caloric value that heating-value determination device 150 is measured, less than the condition caloric value of the 2nd engine When, the flow control valve 151 installed on the 2nd fuel gas supply pipeline 140 is opened, the stream installed on boil-off gas pipeloop 134 Adjustable valve 152 is all or part of to close, by increasing capacitance it is possible to increase the caloric value of combustion gas.Conversely, the combustion measured when heating-value determination device 150 Gas caloric value, higher than the 2nd engine condition caloric value when, can preferentially consume gas supply system 100 in boil-off gas nitrogen Gas composition, the flow control valve 152 installed on boil-off gas pipeloop 134 are opened, installed on the 2nd fuel gas supply pipeline 140 Flow control valve 151 all or part of close.
The gas supply system 100 of the other embodiment correlation of Fig. 2 displaying present invention.Reference picture 2, other realities of the invention The caloric value adjustment portion of the related gas supply system 100 of example is applied, it includes：Measure calculates the combustion for being supplied to the 2nd engine The heating-value determination device 150 of the caloric value of gas；The gas componant supplied with boil-off gas pipeloop 134 is followed to liquefied gas The caloric value regulation pipeline 153 that endless tube line 135 reclaims；And it is separately mounted to the 2nd fuel gas supply pipeline 140, boil-off gas circulation Flow control valve 151,152,154 on pipeline 134, caloric value regulation pipeline 153.
It is additional the saying to other drawing symbols of the gas supply system 100 of other embodiment correlation of the present invention below Bright, other are all identical with above-described embodiment, in order to avoid being repeated with the above, omit the description.
The import side ports of caloric value regulation pipeline 153 are connected with the top of boil-off gas pipeloop 134, export side ports It is connected with the leading portion of the 2nd expansion valve 136 on liquefied gas pipeloop 135.As described above, with boil-off gas pipeloop The nitrogen gas component of high concentration is included in the gas componants of 134 movements, compared to rising with the movement of the 2nd fuel gas supply pipeline 140 Part boil-off gas after pressurization, caloric value are relatively low.Therefore, gas part moved with boil-off gas pipeloop 134 Composition is recycled to liquefied gas pipeloop 135, just can lift and adjust the gross calorific power for the combustion gas for being supplied to the 2nd engine.Together When, the gas componant that part is moved with boil-off gas pipeloop 134 is recycled to liquefied gas and followed by caloric value regulation pipeline 153 Endless tube line 135, can effectively it adjust to gas supply amount corresponding to the supply of the 2nd engine calls.
In caloric value regulation pipeline 153, the portion gas composition that regulation is moved with caloric value regulation pipeline 153 is installed The flow control valve 154 of supply.
The combustion gas caloric value information that flow control valve 154 determines according to heating-value determination device 150, with the 2nd engine Condition caloric value information, its switch degree can be automatically adjusted either manually or by control unit by operator, with regulation part with The supply for the gas componant that caloric value regulation pipeline 153 moves.In addition, unlike this, it is illustrated that do not marked in though, according to peace Traffic aware portion on the 2nd fuel gas supply pipeline 140 or the 2nd engine does not mark the fuel gas supply amount information determined, The switch degree of the flow control valve 154 on caloric value regulation pipeline 153 can be adjusted.
Gas supply system 100 and this of the embodiment of the present invention have identical structure, re-liquefied for boil-off gas Process, during the gas after to pressurization depressurizes, produce containing the of a relatively high gas componant of nitrogen gas component, by it Combustion gas as the 2nd engine is utilized, meanwhile, it is re-liquefied by being supplied to containing the relatively low liquid component of nitrogen gas component Process, the nitrogen gas component in gas supply system 100 can be effectively consumed, and by lasting reduction gas supply system 100 Nitrogen content, the re-liquefied efficiency of boil-off gas and the re-liquefied function of re-liquefied pipeline can be lifted.
Meanwhile caloric value adjustment portion measure or regulating gas caloric value, according to the condition caloric value of engine calls, regulation and control The caloric value of combustion gas processed, there is the effect for effectively utilizing and managing combustion gas.
The embodiment that the present invention is illustrated by accompanying drawing, which is used as to refer to, to be illustrated, but this only represents demonstration, in institute of the present invention The people with general knowledge is appreciated that various change or similar other embodiment is also all feasible in category technical field.Cause The real scope of this present invention should be determined by appended entitlement requests scope.

Claims (7)

  1. A kind of 1. gas supply system, it is characterised in that the holding vessel including storage liquid gas and boil-off gas；
    Possess the compression unit that the boil-off gas in the holding vessel pressurizes, the boil-off gas after being pressurizeed by compression unit, by it It is transported to the 1st fuel gas supply pipeline of the 1st engine；
    Branch is formed at the compression unit middle-end, the boil-off gas after the compression unit part is pressurizeed is transported to the 2nd and started 2nd supply burning line of machine；
    The supply of the part boil-off gas after the pressurization is received, is carried out re-liquefied re-liquefied pipeline；And measure and Adjust the caloric value adjustment portion of the caloric value to the supply combustion gas of the 2nd engine.
    The re-liquefied pipeline, comprising：
    Cool down the cooling end of the boil-off gas after the pressurization；, will after boil-off gas after the pressurization is by the cooling end It carries out the 1st expansion valve of the 1st wheel decompression；Boil-off gas by gas-liquid mixture phase after the 1st expansion valve is separated into 1st gas-liquid separator of gas componant and liquid component；The gas componant that 1st gas-liquid separator separates go out is supplied to The boil-off gas pipeloop of 2 engines；And receive the liquefied gas for the liquid component that the 1st gas-liquid separator separates come out Pipeloop.
  2. 2. gas supply system according to claim 1, it is characterised in that the caloric value adjustment portion, comprising：
    Measure is supplied to the heating-value determination device of the caloric value of the 2nd engine gas；And
    The flow control valve possessed respectively in the 2nd fuel gas supply pipeline and the boil-off gas pipeloop.
  3. 3. gas supply system according to claim 2, it is characterised in that the caloric value adjustment portion, comprising：
    By the gas componant in and then the 1st gas-liquid separator of the boil-off gas circular route flowing, the liquefaction is delivered to The caloric value regulation pipeline that gas pipeloop is circulated；And the flow control valve possessed in the caloric value regulation pipeline.
  4. 4. the gas supply system according to Claims 2 or 3, it is characterised in that the respective flow control valve, according to institute The combustion gas caloric value information that heating-value determination device determines is stated to operate to control.
  5. 5. gas supply system according to claim 4, it is characterised in that the re-liquefied pipeline, including：
    Installed in liquefied gas pipeloop；The liquid component that 1st gas-liquid separator separates are come out carries out the 2nd wheel decompression 2nd expansion valve；After will be by the 2nd expansion valve, the boil-off gas of gas-liquid mixture phase be separated into gas componant and body fluid into The 2nd gas-liquid separator divided；The gas componant of the 2nd gas-liquid separator separates is supplied to the holding vessel or described The vapor return line line of the compression unit front end on 1 fuel gas supply pipeline；And by the 2nd gas-liquid separator sub-department Liquid component, be supplied to the liquefied gas restoring pipeline of the holding vessel.
  6. 6. gas supply system according to claim 1, it is characterised in that the cooling end, comprising：
    By the boil-off gas after pressurization, go out with the boil-off gas of the compression unit front end and the 1st gas-liquid separator separates At least one of gas componant, carry out the heat exchanger of heat exchange.
  7. 7. gas supply system according to claim 1, the 1st expansion valve, it is characterised in that according to the described 2nd hair The corresponding pressure condition of pressure of boil-off gas after the gaseous-pressure condition of motivation requirement, or part pressurization, by described in Boil-off gas after pressurization is depressurized.
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CN107735561B (en) 2020-04-10
WO2016200089A1 (en) 2016-12-15
JP6533311B2 (en) 2019-06-19
JP2018536116A (en) 2018-12-06

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